IMO this may have somthing to do with scaling or possibly a filter, try again with default NVCP settings including your monitor’s resolution (with no resizing).
I reset NVCP to defaults, globally and for the app. The result now is that grass is still being rendered as triangles (see screenshot) and trees doesn’t get rendered at all (they where ugly rectangle sprites before the NVCP reset).
Thats deffo not how it looks like and should look like. Theres obviously something wrong. Doesnt look like this on my side and never seen something like this.
But no idea honestly what it could be. Also, the black squares are indicating you have a serious problem either hardware related or software, but something is broken.
Toggle fullscreen / windowed mode and see if it helps? if not close the sim and delete UserCfg.opt. Next time you start MSFS will build a new one with default settings so check that the path to your packages hasn’t changed. Also you could try switching DX versions.
I have a feeling that there is a problem with your GPU, this looks a bit like if it has problem to rendering correctly. Id check if your GPU drivers are correct and updated.
Otherwise i would say it could be that you have a defect on your GPU if nothing else helps.
Are you running DX11 or DX12? Try DX11
Id try a reinstall, delete / turn off the rolling cache and deleting shader cache.
If you have an older GPU around, i would test with that if the reinstall does not help, im thinnk it could be a defect on your GPU or a too weak Power Supply.
Okey, thats quite on the limit, depending on what other parts you have in there. A PSU calculator shows 91% load with only your GPU/CPU, without any starage devices, USB powered devices, Fans, RAM, etc… and this without any OC applied…
EDIT: sorry, i looked wrong. 850W should be enough, depending on what else you have in your system and your OC. 850W is the minimum tho, in the worst case you could hit a limit, but it should be enough.